microwaves wireless communication

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  • wireless communication- microwaves
    • microwaves are used for satellite communications
      • communications to and from satellites using microwaves
        • but you need wavelengths which can pass easily through the earth watery atmosphere without too much absorption.
      • for satellite TV and phones, the signal from a transmitter is transmitted into space...
        • ... where its picked up by the satellites receiver dish orbiting the earth... the satellite transmits the signal back to earth in a different direction....
          • ... where its received by a satellite dish on the ground
      • ... where its picked up by the satellites receiver dish orbiting the earth... the satellite transmits the signal back to earth in a different direction....
        • ... where its received by a satellite dish on the ground
      • microwaves are also used by remote sensing satellites...
    • microwaves are also used for mobile phones...
      • mobile phone calls travel as microwaves, from your phone to local transmitter
      • microwaves have a shorter wavelength than radio waves so they dont diffract much...
        • this means that they are affected by the curvage of the earth..
      • this means that they are affected by the curvage of the earth..
      • as a result microwave transmitters need to be positioned in line of sight.... they are usually positioned high up on hilltops... and positioned fairly close together
      • in adverse weather, there can be signal loss through absorption of water in the atmosphere
      • sometimes there is interference between signals, which can also affect signal strength
    • mobile masts may be dangerous...
      • if microwaves are absorbed by water molecules in living tissue, cells may be burned or killed
      • some think that the microwaves emitted into your body from using mobile phones could damage health
      • any potential dangers can be increased by prolonged exposures to microwave radiations
  • microwaves are also used for mobile phones...
    • mobile phone calls travel as microwaves, from your phone to local transmitter
    • microwaves have a shorter wavelength than radio waves so they dont diffract much...
      • as a result microwave transmitters need to be positioned in line of sight.... they are usually positioned high up on hilltops... and positioned fairly close together
      • in adverse weather, there can be signal loss through absorption of water in the atmosphere
      • sometimes there is interference between signals, which can also affect signal strength

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